Removed useless before_script docker login command

Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

.gitlab-ci.yml

@@ -1,7 +1,3 @@
-# This file is a template, and might need editing before it works on your project.
-# This is the Gradle build system for JVM applications
-# https://gradle.org/
-# https://github.com/gradle/gradle
 image: docker:latest
 services:
   - docker:dind
@@ -24,7 +20,6 @@ variables:
 
 before_script:
   - export GRADLE_USER_HOME=`pwd`/.gradle
-  - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
 
 build:
   image: gradle:jdk15